A few years back I received in trade a number of diazo “blueprints” (white paper, blue lines). tucked in among ’em were a number of SST diagrams, including two very large & detailed Boeing 2707 layouts… the original 2707 (swing wing) and 2707-200 (swing wing & canard). These were about 3 feet by 8… very big. And as with virtually all blueprints that were actually made to be used, they were folded, not rolled. Having been folded for 40+ years meant that they were a scanning nightmare… the paper was very stiff, and had it been fed through a large format scanner it would have produced dismal results. The best way to deal with such prints is to unfold them an either compress them (impossible give the size) or roll them up, and leave them to st for several months. I rolled them up. And forget them for several *years.* Just found ’em again. They are fragile, but have “relaxed” from being folded, and are now happily cylindrical.
I think they’d make dandy cyanotypes. They would have to be smaller than the originals, however… 2 feet by 5. Anyone interested? They’d be pretty pricy, on the order of $80-$100. But you’d be the only kid on your block with one…
